—They is an          look on his face. What for?

—Because he heard the          news about his students just now.[ ]

A. excited; exciting

B. exciting; excited

C. excited; excited

D. exciting; exciting

用阿拉伯数字编写卷内文件页号，以固定排列顺序，其作用是（）。

A.统计文件

B.保护文件

C.编辑文件

D.方便查找

E.方便交接